\documentclass[tikz,border=2pt]{standalone}
\begin{document}

\begin{tikzpicture}


\draw[step=1,color=gray!40] (-2,-2) grid (2,2);
\draw[->] (-3,0) -- (3,0);
\draw[->] (0,-3) -- (0,3);
\draw (0,0) ellipse (1 and 0.5);


\end{tikzpicture}
\end{document}